(57) In a fluid jet loom (1), values that are based on weft signal generation timings
generated from a weft sensor (18 or 28) and that are obtained when a normally operating
weft supply package (10), used for supplying weft, is used are successively calculated
according to respective predetermined operating period parts, and standard threshold
values for determining a defect in the weft supply package (10) are determined on
the basis of these values according to the predetermined operating period parts while
making allowance for an allowable range, and are previously stored as threshold-value
information corresponding to passage of the operating period. Thereafter, when a weft
supply package (10) of a same weft type is used, a standard threshold value corresponding
to an operating period part is read out from the stored threshold-value information,
and the value based on the weft signal generation timings generated from the weft
sensor (18 or 28) is calculated, the calculated value based on the weft signal generation
timings and the read out standard threshold value corresponding to the operating period
part are compared with each other, and a determination is made as to whether or not
a defect has occurred in the currently used weft supply package from a magnitude relationship
obtained from the comparison.
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